I have a 1989 Cadillac DeVille. How do I get the security light to go out? on 1990 Cadillac DeVille

Back in June I reset the security code and since then I haven't had any problems with the car that was until Friday. The Vat's Security System light is staying on and I can't even get my car to crank. How do I do away with this system? How long will it take?

Asked by for the 1990 Cadillac DeVille
1 answer 2 comments
If you are mechanical and electrical inclined, you might check out YouTube videos, and search passlock. There is several videos on this subject with how to. Your Welcome
I have checked out the video's and the passlock sights, tried everything but changing the module and lock cylinder. Thank you for your advice I am looking into a module that will get rid of the system forever.
Then you need an ECM that has the feature removed from it's programming.